Mechanochemical block copolymerization in heterogeneous systems of the solid polyethylene-acrylamide-sodium dodecyl sulfate aqueous solutions has been studied by ultrasonic irradiation at 30 degrees C. An additional effect of the solid polyethylene and the effects of acrylamide, and sodium dodecyl sulfate concentrations on mechanochemical block copolymerization were investigated. The block copolymerization of acrylamide was initiated by free radical produced from the polyethylene particles by ultrasonic waves. The rate of copolymerization R(p) increased with increasing additional amount of polyethylene and that value was of the order of 10(-3) mol/l s. In addition, the R(p) was given by R(p) proportional to [Acrylamide][Sodium dodecyl sulfate].